Focal length variable lens apparatus

Details Focal length variable lens apparatus Focal length variable lens apparatus

1984-08-31

1987-10-06

Corbin, John K.

G02B 711, G02B 1514

Patent

active

046978917

ABSTRACT:
The present invention discloses a focal length variable lens apparatus in which a focal length variable lens system has a magnification varying system which, upon movement causes variation of the focal length of the entire system and a compensating system for compensating for the shift of an image plane resulting from the change of the focal length. The apparatus is provided with first computing apparatus for computing the position of the compensating system in accordance with the computed compensation obtained from information from the position of said magnification varying system moved position, second computing apparatus for computing the position of the compensating system in accordance with optically sensed image sharpness, and sequence control apparatus for initiating operation of the second computing apparatus after operation of the first computing apparatus.

REFERENCES:
patent: 3972056 (1976-07-01), Toujimoto et al.
patent: 4161756 (1979-07-01), Thomas
patent: 4491396 (1985-01-01), Isobe et al.

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